CVE-2026-98625 (GCVE-0-2026-98625)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
netfilter: flowtable: publish HW_DEAD after worker is done
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: publish HW_DEAD after worker is done flow_offload_work_del() sets NF_FLOW_HW_DEAD before the work handler clears NF_FLOW_HW_PENDING. Once a flow is both HW_DYING and HW_DEAD, a concurrent garbage collection pass can remove it and schedule it for RCU freeing. The offload worker holds neither an RCU read lock nor a reference to the flow. If it is preempted after publishing HW_DEAD, the RCU callback can free the flow before the worker resumes and clears HW_PENDING, resulting in a use-after-free. Move HW_DEAD publication to the common worker epilogue after the pending bit is cleared, making it the final flow access by destroy work. Order all preceding flow accesses before publishing the bit that allows garbage collection to free the object.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < f92e8f39726ba68a7c42c6b7566be687c8161579 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < 00e452a7ca9fda135ea3d04a11128d5088e354a8 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < 56f39c7d139bb76072efe2fb3dcafc13ba915ad8 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < e20701843032c438f879066a77ea85e361c6b999 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < b4f0f05dfbe836a171bff261f17d098a4d5461ea (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < b0ef9450e93f2adeb77593db14c2ac7c6c8f5060 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < f26652e99f519e6bd34f8a9b48fbb33c603585f2 (git)
Affected: 2c8897953f3b2ff5498f3f275708a742bfcdbc24 , < d644b23afe1ef509c9961a6d84a093c2587edf02 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: publish HW_DEAD after worker is done\n\nflow_offload_work_del() sets NF_FLOW_HW_DEAD before the work handler\nclears NF_FLOW_HW_PENDING. Once a flow is both HW_DYING and HW_DEAD, a\nconcurrent garbage collection pass can remove it and schedule it for RCU\nfreeing.\n\nThe offload worker holds neither an RCU read lock nor a reference to the\nflow. If it is preempted after publishing HW_DEAD, the RCU callback can\nfree the flow before the worker resumes and clears HW_PENDING, resulting\nin a use-after-free.\n\nMove HW_DEAD publication to the common worker epilogue after the pending\nbit is cleared, making it the final flow access by destroy work. Order all\npreceding flow accesses before publishing the bit that allows garbage\ncollection to free the object."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-98625",
    "datePublished": "2026-10-18T15:19:46.372Z",
    "dateReserved": "2026-09-25T10:25:14.360Z",
    "dateUpdated": "2026-10-19T09:22:53.321Z",
    "state": "PUBLISHED"
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          }
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        "id": "CVE-2026-98625",
        "lastModified": "2026-10-19T10:19:26.700",
        "metrics": {},
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:03:53+00:00",
      "cve": "CVE-2026-98625",
      "id": "CVE-2026-98625",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "237",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: flowtable: publish HW_DEAD after worker is done",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98625.json",
      "version": "3"
    }
  }
}



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